idk how this happened but i am up to around where you unlock the teleporter in career, and i was just looking back at my achievements and i realized i dont have the achievement for unlocking the 6th vehicle (the hovercraft). this is really annoying cuz i got the achievements for the 3 vehicles after this one. i only have one band on world tour and i only use one gamertag. so i dont understand how this could have happened. any help?